#region The MIT License
// The MIT License
// 
// Copyright (c) 2009 octalforty studios
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#endregion
using System;
using System.Net;

namespace octalforty.Componento.ComponentModel.Installation.Web
{
    public class HttpRequest : IHttpRequest
    {
        #region Private Fields
        private readonly HttpWebRequest httpWebRequest;
        #endregion

        public HttpRequest(HttpWebRequest httpWebRequest)
        {
            this.httpWebRequest = httpWebRequest;
        }

        #region IHttpRequest Members
        /// <summary>
        /// Gets or sets the value of the <c>If-Modified-Since</c> HTTP header.
        /// </summary>
        public DateTime IfModifiedSince
        {
            get { return httpWebRequest.IfModifiedSince; }
            set { httpWebRequest.IfModifiedSince = value; }
        }

        /// <summary>
        /// Returns a response from an Internet resource.
        /// </summary>
        /// <returns></returns>
        public IHttpResponse GetResponse()
        {
            //
            // This fixes a vexing exception (http://blogs.msdn.com/ericlippert/archive/2008/09/10/vexing-exceptions.aspx)
            // with HttpWebRequest.GetResponse() throwing exception on HTTP 304 (Not Modified), which it should not do.
            try
            {
                return new HttpResponse((HttpWebResponse)httpWebRequest.GetResponse());
            }
            catch(WebException e)
            {
                if(e.Response == null || e.Status != WebExceptionStatus.ProtocolError)
                    throw;

                return new HttpResponse((HttpWebResponse)e.Response);
            } // catch
        }

        /// <summary>
        /// Gets or sets the value of the Referer HTTP header.
        /// </summary>
        public string Referer
        {
            get { return httpWebRequest.Referer; }
            set { httpWebRequest.Referer = value; }
        }
        #endregion
    }
}